Machine for unwinding wire in which the unwinding coil is driven from a particular source of motion



July 2, 1935. R zsc c 2,006,819

mourns FOR UNWINDING WIRE IN WHICH THE UNWINDING COIL 1s DRIVEN FROM A PARTICULAR SOURCE OF MOTION Filed March 19, 1951 ENVENTOR REINHOLD ZSCHACH ATTORNEY Patented July 2, 1935 MACHINE FOR UNWINDING WIRE IN WHICH THE UNWINDING COIL IS DRIVEN FROM A PARTICULAR SOURCE OF MOTION Reinhold Zschach, Eindhoven, Netherlands, as-

signor to Radio Corporation of America, a corporation of-Delaware Application March 19, 1931, Serial No. 523,824 In the Netherlands June 16, 1930 4 Claims.

When winding wire with coiling machines in which the winding spool is driven at a variable velocity, the wire is. usually unwound from a winding roll, which is also called unwinding 5 spool, from which the wire is led either directly or through the intermediary of other mechanisms, to a rotary winding shaft for coiling the wire. The unwinding spool is usually taken along by the wire tension and is not driven separately.

Especially when coiling very thin wires this may give rise to trouble in practice. In fact, the wire may seize on the unwinding spool for one reason or other, which may be due, for example, to jamming of the wire between two windings, thus causing rupture of the wire.

The present invention has for its object to provide means for avoiding this drawback by driving the unwinding spool in accordance with the demand. Indeed, rupture of the wiremay occur if for some reason or other an insuflicient quantity of wire is supplied to the continuously rotating winding shaft, which requires a given quantity of wire. This drawback is substantially avoided by driving the unwinding spool in this case temporarily, or in general by rendering the driving of the unwinding spool, also if the winding spool is actuated at a variable speed, dependent on the cause of the said trouble, i. e. a shortage, a suflicient quantity or an excess of wire on the o winding spool.

In one form of construction of the invention the resistance in the current circuit of the motor may be controlled by the movable lever. To this effect the lever may have fixed to it a brush passing over a combination of contacts, for example, a commutator, whose contacts and bars are connected to a resistance box.

Furthermore the lever may operate, moreover, a current change-over device for the motor.

0 The commutator may be divided into three series of bars, one of which serving for the resistance box controlling the excitation of the motor when the latter is going forward. The second series serves for the position in which no excitation 5 occurs but the motor is braked and the third series serves for the resistance box controlling the excitation when the motor is going backward.

The invention will be more clearly understood by reference to the accompanying drawing, rep- 0 resenting, by way of example, one embodiment thereof.

Fig. 1 shows in diagrammatic form an embodiment of the invention essentially characterized by the presence of a commutator and one re- 5 sistance-box.

Fig. 2 illustrates a form of the invention in which the commutator is subdivided into three series of bars.

Fig. 1 shows an unwinding spool I which is driven by a motor 9, a winding wire 2 leading over 6 a pulley 4 and a pulley 5 is wound on a winding shaft 6. Pulley 4 is preferably mounted on the frame of the apparatus while pulley 5 is mounted on a rocker arm l2. The pulley block 5 is fixed to the lever l2. The lever l2 carries a brush 23 which is attached to this lever by means of a member 24. By means of a draw bar I 6 which is flxed'to the lever l2 at H this lever operates v a motor brake IS. The brush 23 moves over the bars of the commutator l3. These bars are connected by means of current conductors 20, 2| and 22 to various points of the motor series-resistance Hi. When the lever I 2 is pivotedabout the point l8' the brush insures the series-connection of a larger or smaller resistance in the motor current circuit depending on the amount of wire 2 between spools l and 6.

In Fig. 2 the commutator is subdivided into three series of bars. The series in the segment 0: serves for a resistance box is, in the same 25 manner as described with reference to Fig. 1, said resistance box being. inserted in the current circuit effecting the forward movement of the motor 9, The series of bars in the segment a are not connected to the motor current circuit, so

that the motor, ii' the brush bears on this bar, is not excited. The series of lamels in the segment '7 serves for a resistance box I90 which is inserted in the current circuit when the motor is going backward. By means of a rod 25 the lever 5 i2 operates a change-over switch 0 for reversing the current direction of the motor. By this circuit arrangement it is rendered possible that the unwinding spool supplies wire when the motor is going forward, i. e. if the brush is in the 40 segment 7. When the motor is going backward. the unwinding spool will wind up wire, which may be desirable if the winding shaft has an excess of wire wound on it.

I claim:

1. In a material rewinding device, spaced rotary members, independent driving means therefor, one of said driving means comprising an electric motor, current supplyleads for said motor, a variable resistance interposed in at least one of said leads, means for varying the effectiveness of the resistance and responsive to tension in the material being rewound to thereby control the speed of the motor, means responsive to an abnormal release in tension in the material tension in the material is resumed for restoring the direction of rotation of the motor.

2. In a material rewinding arrangement, spaced rotary members, independent driving means therefor, one of said driving means comprising an electric motor, current supply leads for the motor, avariable resistance arrangement connected to at least one of said leads, means to vary the effectiveness of said variable resistance and responsive to tension in the material being rewound to thereby control the speed of rotation of the motor, means responsive to an abnormal release in tension in the material being rewound to cause a reversal in the direction of rotation of the motor, said last named means comprising a displaceable pulley device cooperating with a reversing switch arrangement, and means upon restoration of normal tension in the material being rewound for again reversing the direction of rotation of the motor so that it assumes its norone of said leads for controlling the flow of current therein, means for varying the effectiveness of the resistance and responsive to tension in the material being rewound to thereby control the speed of the motor, means responsive to an ab- 5 normal release in tension in the material being rewound to cause a reversal in the direction of rotation of the motor and means for controlling the speed of rotation of the motor when rotat-- ing in reverse controlled by the extent of release in tension in the material being rewound. a

4, In a wire coil winding machine, a spindle about which the wire coil is wound, a wire supply spool, wire guiding means between the spindle and the supply spool comprising, a displaceable pulley device adapted to be displaced in accordance with the length of wire between the spool and the spindle, an electric motor for rotating said spool, current supply leads for the motor, a variable resistance interposed in at least one of said leads, means to vary the effectiveness of the variable resistance and responsive to tension in the wire between the spool and the spindle, means for reversing the rotation of said motor, and means responsive to an abnormal length of wire between the spool and the spindle to operate the reversal means.

REINl-IOID ZSCHACH. 

